Question

Each question below has two blanks, which is indicating that something has been omitted. Choose the most suitable option indicating the words that can be used to fill up the blanks in the sentences to make them meaningfully complete. The second difficulty in assessing the systematic review was its inclusion of __________studies. While the methodology of systematic reviews of randomized controlled trials is______ to a high degree, this is not the case for systematic reviews of observational studies. 

A Observational, Uniform
B Abstract, Unnecessary
C Imaginative, Diverse
D Intuitive, Variable
E Assumed, Liable
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